Salt block



FIG. 1 is a front, top, and left side perspective view of a salt block;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of the front elevational view;

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image of the left side elevational view; and,

FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image of the top plan view. 

CLAIM The ornamental design for a salt block, as shown and described. 